Earlier today I was alerted to the existence of this scene from a Silver Age-era Flash story:
(FYI, Flash: nothing is impossible in comic books.)
This scene appears to be quite (in)famous, turning up dozens of results on Google, but none of them give a source for the original comic. Nor do they state what happened next, which is especially interesting given that other questions on this site indicate that The Flash cannot move or breathe in space.
When did this happen?